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Super twist nematic liquid crystal display driver for reducing power consumption

  • US 20040104875A1
  • Filed: 11/13/2003
  • Published: 06/03/2004
  • Est. Priority Date: 11/16/2002
  • Status: Active Grant
First Claim
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1. A super twist nematic (STN) liquid crystal display (LCD) driver which drives a STN LCD panel, the STN LCD driver comprising:

  • a reference voltage generating unit which generates a reference voltage in response to an external voltage;

    a voltage boosting unit which generates a boosting voltage by boosting the external voltage;

    a voltage control unit which generates a first segment voltage and a second segment voltage which drive a segment electrode of the STN LCD panel in response to the reference voltage and the boosting voltage;

    a first common voltage generating unit which drives a common voltage of the STN LCD panel in response to the external voltage, a ground voltage, and the first segment voltage and generates a first common voltage, the voltage level of which is higher than the voltage level of the first segment voltage, using a predetermined resistance ratio; and

    a second common voltage generating unit which drives a common voltage of the STN LCD panel in response to the external voltage, the ground voltage, and the first segment voltage and generates a second common voltage, the voltage level of which is lower than the voltage level of the first segment voltage, using a predetermined resistance ratio.

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